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Reverse components

Reverse Components Black-One D2 31.8 mm stem

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Features of Reverse components Black-One D2 31.8 mm

Product description of Reverse Components Black-One D2 31.8 mm stem

Description summary

1 Stem, 2 Handlebar Diameters:
- The Black One D-2 Stem Builds On The Success Of Our Flagship Black One Enduro Stem And Brings In The Ability To Run Both Ø31.8mm And Ø35mm Handlebars With One Stem. The Special Designed Shim Allows The Use Of Ø31.8mm Bars And When Removed, It Works As An Ø35mm Stem. The Shim Provides A Wide, Smooth Clamping Area Which Is Ideal For Use With Carbon Bars.

- The Intelligent No-Gap Clamping Design In The Bottom Ensure No Pinch Points, And Equal Clamping Force For Safety And Stability. Because The Most Loads And Notching Effects Are Always At The Bottom Of The Handlebar. And Our Smooth No-Gap Surface Enlarges The Lifetime Of Your Handlebars. The Black One D-2 Is Ideal For Riders Who Have A Few Sets Of Ø31.8mm/35mm Bars With Different Rises And Want To Continue Using Them All, Or Who May Want To Upgrade To A 35mm Bar In The Future, Without Having To Buy Another Stem. Available In 35mm Lengths In Black Matt Finishes. We Also Offer An Extra Light Black One D-2 Titanium Version Of This Stem With Understated Black Or Polished Finishes, With Full Titanium Bolts.


Specifications:

- Length: 35 Mm
- Clamping Diameter: Ø 31.8 Mm & Ø 35.0 Mm
- Angle: 8°
- Stack Height: 40 Mm
- Clamping Platform: 50 Mm
- Ø Head Tube: 1 1/8´´
- Weight: 152g (+/- 5% Weight Tolerance)
- Material: Aluminium 6061 T6

Specifications

Manual

Technical specifications of Reverse components Black-One D2 31.8 mm

Features of Reverse components Black-One D2 31.8 mm

Color Black

Color

Black

Recommended Use MTB Cycling

Recommended Use

MTB Cycling

Materials Aluminum

Materials

Aluminum

Key differentiators

Constructed from durable 6061 T6 aluminum in a black matt finish.

Dual handlebar compatibility with an included shim for both Ø 31.8 mm and Ø 35.0 mm diameters.

Engineered with a 35 mm length and 40 mm stack height for responsive MTB handling.

Features a no-gap clamping design for even pressure distribution, ideal for carbon handlebars.

Technology in Reverse Components Black-One D2 31.8 mm stem

Energy rating

Warnings

4.5 / 5

2 Reviews

What our customers are saying about Reverse Components Black-One D2 31.8 mm stem

Reverse Components Black-One D2 31.8 mm stem

Perfect

2023/10/25

Dmitry

Excellent quality stem. Looks reliable, not flimsy. Very convenient that you buy a version for two handlebar diameters at once with a single purchase.

Reverse Components Black-One D2 31.8 mm stem

Good product

2022/09/05

Kb

Handy stem for swapping up your position on different bike/bar combos

Write a review about this product

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The question has already been answered, thank you very much for trying to help another customer. We will count on you for future questions.

Include AI Generated questions and answers

2026-10-27

Generated by AI and verified

Reverse Components Black-One D2 31.8 mm stem

What is the main benefit of the Reverse Components Black-one D2 stem?

Answer of Generated by AI and verified

The main benefit of this stem is its versatility. It is designed to be compatible with both Ø 31.8 mm and Ø 35.0 mm handlebars, thanks to a special removable shim. This allows you to use different handlebars or upgrade in the future without needing to purchase a new stem.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black-One D2 31.8 mm stem

What material is the Black-one D2 stem made from?

Answer of Generated by AI and verified

The Reverse Components Black-one D2 stem is constructed from aluminum, finished in a black matt color.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black-One D2 31.8 mm stem

Is the Reverse Components Black-one D2 stem worth the investment?

Answer of Generated by AI and verified

The Reverse Components Black-one D2 stem offers versatility with its dual handlebar compatibility and durable aluminum construction, making it a valuable choice for cyclists looking for reliability and flexibility.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black-One D2 31.8 mm stem

What are the key dimensions of the Black-one D2 stem?

Answer of Generated by AI and verified

This stem has a length of 35 mm and a stack height of 40 mm. It also features a 50 mm wide clamping platform.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black-One D2 31.8 mm stem

What is the handlebar clamp diameter for this stem?

Answer of Generated by AI and verified

The Black-one D2 stem is designed to fit two standard handlebar clamp diameters: Ø 31.8 mm (with the included shim) and Ø 35.0 mm (without the shim).

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black-One D2 31.8 mm stem

What is the clamping design of this stem?

Answer of Generated by AI and verified

This stem features an intelligent no-gap clamping design on the bottom. This ensures equal clamping force and a smooth surface, which helps to increase the lifetime of your handlebars by avoiding pinch points.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black-One D2 31.8 mm stem

What is the stem length of the Reverse Components Black-one D2?

Answer of Generated by AI and verified

The stem length of the Reverse Components Black-one D2 is 35 mm.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black-One D2 31.8 mm stem

Is this stem suitable for use with carbon handlebars?

Answer of Generated by AI and verified

Yes, the design is well-suited for carbon handlebars. The included shim provides a wide and smooth clamping area, which is ideal for distributing pressure evenly on carbon bars.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black-One D2 31.8 mm stem

Who is this stem ideal for?

Answer of Generated by AI and verified

This stem is ideal for mountain bike riders who own handlebars of both Ø 31.8 mm and Ø 35.0 mm diameters and wish to switch between them. It's also a great choice for those who plan to upgrade their handlebar to the 35 mm standard in the future but don't want to buy a new stem.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black-One D2 31.8 mm stem

What handlebar diameters is the Black-one D2 stem compatible with?

Answer of Generated by AI and verified

This stem is compatible with two handlebar diameters. It fits Ø 31.8 mm handlebars when using the included shim and Ø 35.0 mm handlebars when the shim is removed.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black-One D2 31.8 mm stem

What steerer tube diameter does this stem fit?

Answer of Generated by AI and verified

This stem is designed to fit a 1 1/8'' steerer tube, which is a common standard for many mountain bikes.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black-One D2 31.8 mm stem

How does the Reverse Components Black-one D2 stem compare to the Sixpack Racing Vertic 35 Mm Stem?

Answer of Generated by AI and verified

The Reverse Components Black-one D2 stem features a unique no-gap clamping design and supports both Ø31.8mm and Ø35mm handlebars, offering versatility that may not be available with the Sixpack Racing Vertic 35 Mm Stem.

* Generated by AI based on customer and product data

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Frequently bought together
Best sellers

Use cases

Mountain Biking (Enduro/All-Mountain) 90% Fit

The short 35 mm length provides quick, responsive steering ideal for technical descents and aggressive trail riding. Its robust aluminum construction and wide clamping platform offer the stiffness and control needed for demanding terrain.

35 mm stem length,Aluminum construction,50 mm clamping platform

Downhill & Freeride Mountain Biking 80% Fit

Built from durable aluminum with a wide 50 mm clamping platform, this stem provides the strength and steering precision required for high-speed downhill runs and freeride features. It's a solid upgrade for riders seeking enhanced control and reliability.

Aluminum material,50 mm clamping platform,Dual clamp diameter compatibility

Upgrading Cockpit for Modern Handlebars 90% Fit

This stem is a versatile upgrade, offering compatibility with both 31.8 mm and 35.0 mm handlebars. This allows riders to switch to newer, stiffer 35.0 mm bars or stick with the standard 31.8 mm, making it a great all-rounder for future-proofing a bike's cockpit.

Compatible with Ø 31.8 mm & Ø 35.0 mm bars,Aluminum construction,40 mm stack height

Customizing Bike Fit and Handling 70% Fit

With its short 35 mm length and 40 mm stack height, this stem allows riders to fine-tune their riding position for better control and comfort. It's a reliable choice for committed cyclists looking to dial in their bike's handling characteristics for a more enjoyable experience on the trail.

35 mm stem length,40 mm stack height,Aluminum material

Best for

A Solid Upgrade for All-Mountain Riders

This stem offers a great balance of performance and value. The aluminum construction provides durability, while the short 35 mm length and wide 50 mm clamping platform contribute to precise steering control, making it a noticeable improvement for regular trail riding. Its compatibility with both 31.8 mm and 35.0 mm handlebars adds valuable versatility for future upgrades.

Based on: material: aluminum, Stem length: 35 mm, Clamping platform: 50 Mm, Clamp diameter: Ø 31.8 Mm & Ø 35.0 Mm, Precision Steering Control

Ideal for Dialing in Your Cockpit Fit

With a short 35 mm length and a 40 mm stack height, this stem allows for significant adjustments to your riding posture. This is perfect for riders looking to achieve a more responsive and comfortable setup, enhancing both climbing efficiency and descending confidence.

Based on: stem_length: 35 mm, Stack height: 40 Mm, Optimized Riding Posture, Easy Adjustability

Great All-Rounder for Trail and Enduro

This stem is built to be a dependable workhorse. The robust aluminum build and wide clamping area provide the security needed for aggressive riding, while the modern geometry supports responsive handling. It's a versatile choice that delivers solid performance across different mountain biking disciplines.

Based on: material: aluminum, Clamping platform: 50 Mm, Enhanced Ride Security, Precision Steering Control

Benefits

FunctionalFits Two Standard Handlebar Sizes with One Stem

This stem is designed to accommodate both Ø 31.8 mm and Ø 35.0 mm handlebars. Thanks to a specially designed, removable shim, you can easily switch between the two most common handlebar diameters without needing to purchase a separate stem, offering excellent versatility and future-proofing your setup.

Clamp diameter: Ø 31.8 Mm & Ø 35.0 Mm

FunctionalSolid and Reliable Aluminum Construction

Constructed from 6061 T6 aluminum, this stem offers a solid and dependable connection point for your handlebars. This material choice ensures it can withstand the demands of MTB cycling, providing long-term reliability for your bike.

Material: aluminum

FunctionalDesigned to Protect and Extend Handlebar Life

The stem features an intelligent no-gap clamping design at the bottom. This creates a smooth, wide clamping surface that distributes force evenly and avoids pinch points, which helps to extend the life of your handlebars, especially if you use carbon bars.

Clamping platform: 50 Mm

FunctionalSleek, Understated Matte Black Finish

With its clean lines and modern "black matt" finish, this stem adds a touch of understated style to your bike's cockpit. The quality craftsmanship enhances the overall aesthetic, allowing you to take pride in your bike's appearance.

Color: black matt

Ideal buyer profiles

General buyers seeking a versatile mountain bike stem

This buyer is looking for a durable and precisely manufactured stem to upgrade or complete their mountain bike build. They prioritize a secure connection between their handlebars and fork, and value components that offer compatibility with common standards.

The Black-one D2 stem is an excellent fit, constructed from aluminum for durability. It offers great versatility by being compatible with both Ø 31.8 mm and Ø 35.0 mm handlebar clamp diameters. The wide 50 mm clamping platform ensures a secure and stable connection, contributing to precise steering on the trail.

Competitive features

When choosing a new stem for your mountain bike, details like handlebar compatibility and clamping design are crucial. The Reverse Components Black-one D2 stem stands out with its versatile design, allowing it to fit two different handlebar diameters. We'll compare it to other stems from Reverse Components, as well as options from Cannondale and Syncros, to help you determine if its unique features are the right fit for your setup.

Where it excels

Dual handlebar compatibility: A key feature of the Black-one D2 is its ability to accommodate both Ø 31.8 mm and Ø 35.0 mm handlebars thanks to a removable shim. This offers excellent flexibility for riders who own multiple handlebars or plan to upgrade in the future without needing to buy a new stem. Carbon-friendly clamping: The design incorporates a wide, smooth clamping platform and a 'No-Gap' system on the lower side. This distributes clamping force evenly, reducing stress and potential pinch points, which is particularly beneficial for protecting carbon fiber handlebars. Durable construction: Made from aluminum with a 35 mm length and a 40 mm stack height, this stem is built for enduro and all-mountain riding, offering a solid and reliable connection between your fork and handlebars.

Consider alternatives if...

Verdict

The Reverse Components Black-one D2 31.8 Mm Stem is an excellent choice for its innovative dual-diameter compatibility. Its thoughtful design, which prioritizes handlebar longevity and secure clamping, makes it a standout option. If you value versatility and want to future-proof your cockpit for different handlebar standards, this stem provides a smart, single-component solution. While other stems may offer different lengths or angles, the D2's core benefit is its adaptability.

Specs comparison

Specs vs competitors

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Materialaluminumaluminumaluminumaluminumaluminum
Stack Height40 mm34 mm36 mm-38 mm
Clamp Diameter31.8, 35 mm31.8 mm31.7 mm31.8 mm35.0 mm
Stem Length35 mm-70 mm75, 90, 100, 110 mm35 mm
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